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b43: Add debugfs files for MMIO register access
This adds debugfs files for reading and writing arbitrary wireless core registers. This is useful for debugging. Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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5a9f7b047e
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8bd463f4f9
@ -74,6 +74,115 @@ struct b43_dfs_file * fops_to_dfs_file(struct b43_wldev *dev,
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} while (0)
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/* The biggest MMIO address that we allow access to from the debugfs files. */
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#define B43_MAX_MMIO_ACCESS (0xF00 - 1)
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static ssize_t mmio16read__read_file(struct b43_wldev *dev,
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char *buf, size_t bufsize)
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{
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ssize_t count = 0;
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unsigned int addr;
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u16 val;
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addr = dev->dfsentry->mmio16read_next;
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if (addr > B43_MAX_MMIO_ACCESS)
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return -EDESTADDRREQ;
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val = b43_read16(dev, addr);
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fappend("0x%04X\n", val);
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return count;
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}
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static int mmio16read__write_file(struct b43_wldev *dev,
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const char *buf, size_t count)
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{
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unsigned int addr;
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int res;
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res = sscanf(buf, "0x%X", &addr);
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if (res != 1)
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return -EINVAL;
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if (addr > B43_MAX_MMIO_ACCESS)
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return -EADDRNOTAVAIL;
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dev->dfsentry->mmio16read_next = addr;
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return 0;
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}
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static int mmio16write__write_file(struct b43_wldev *dev,
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const char *buf, size_t count)
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{
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unsigned int addr, val;
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int res;
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res = sscanf(buf, "0x%X = 0x%X", &addr, &val);
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if (res != 2)
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return -EINVAL;
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if (addr > B43_MAX_MMIO_ACCESS)
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return -EADDRNOTAVAIL;
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if (val > 0xFFFF)
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return -E2BIG;
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b43_write16(dev, addr, val);
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return 0;
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}
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static ssize_t mmio32read__read_file(struct b43_wldev *dev,
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char *buf, size_t bufsize)
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{
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ssize_t count = 0;
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unsigned int addr;
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u32 val;
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addr = dev->dfsentry->mmio32read_next;
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if (addr > B43_MAX_MMIO_ACCESS)
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return -EDESTADDRREQ;
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val = b43_read32(dev, addr);
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fappend("0x%08X\n", val);
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return count;
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}
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static int mmio32read__write_file(struct b43_wldev *dev,
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const char *buf, size_t count)
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{
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unsigned int addr;
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int res;
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res = sscanf(buf, "0x%X", &addr);
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if (res != 1)
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return -EINVAL;
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if (addr > B43_MAX_MMIO_ACCESS)
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return -EADDRNOTAVAIL;
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dev->dfsentry->mmio32read_next = addr;
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return 0;
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}
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static int mmio32write__write_file(struct b43_wldev *dev,
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const char *buf, size_t count)
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{
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unsigned int addr, val;
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int res;
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res = sscanf(buf, "0x%X = 0x%X", &addr, &val);
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if (res != 2)
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return -EINVAL;
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if (addr > B43_MAX_MMIO_ACCESS)
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return -EADDRNOTAVAIL;
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if (val > 0xFFFFFFFF)
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return -E2BIG;
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b43_write32(dev, addr, val);
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return 0;
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}
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/* wl->irq_lock is locked */
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static ssize_t tsf_read_file(struct b43_wldev *dev,
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char *buf, size_t bufsize)
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@ -496,6 +605,10 @@ out_unlock:
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.take_irqlock = _take_irqlock, \
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}
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B43_DEBUGFS_FOPS(mmio16read, mmio16read__read_file, mmio16read__write_file, 1);
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B43_DEBUGFS_FOPS(mmio16write, NULL, mmio16write__write_file, 1);
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B43_DEBUGFS_FOPS(mmio32read, mmio32read__read_file, mmio32read__write_file, 1);
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B43_DEBUGFS_FOPS(mmio32write, NULL, mmio32write__write_file, 1);
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B43_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
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B43_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
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B43_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
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@ -584,6 +697,9 @@ void b43_debugfs_add_device(struct b43_wldev *dev)
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return;
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}
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e->mmio16read_next = 0xFFFF; /* invalid address */
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e->mmio32read_next = 0xFFFF; /* invalid address */
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#define ADD_FILE(name, mode) \
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do { \
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struct dentry *d; \
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@ -596,6 +712,10 @@ void b43_debugfs_add_device(struct b43_wldev *dev)
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} while (0)
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ADD_FILE(mmio16read, 0600);
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ADD_FILE(mmio16write, 0200);
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ADD_FILE(mmio32read, 0600);
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ADD_FILE(mmio32write, 0200);
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ADD_FILE(tsf, 0600);
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ADD_FILE(ucode_regs, 0400);
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ADD_FILE(shm, 0400);
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@ -620,6 +740,10 @@ void b43_debugfs_remove_device(struct b43_wldev *dev)
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return;
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b43_remove_dynamic_debug(dev);
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debugfs_remove(e->file_mmio16read.dentry);
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debugfs_remove(e->file_mmio16write.dentry);
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debugfs_remove(e->file_mmio32read.dentry);
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debugfs_remove(e->file_mmio32write.dentry);
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debugfs_remove(e->file_tsf.dentry);
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debugfs_remove(e->file_ucode_regs.dentry);
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debugfs_remove(e->file_shm.dentry);
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@ -36,6 +36,10 @@ struct b43_dfsentry {
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struct b43_wldev *dev;
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struct dentry *subdir;
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struct b43_dfs_file file_mmio16read;
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struct b43_dfs_file file_mmio16write;
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struct b43_dfs_file file_mmio32read;
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struct b43_dfs_file file_mmio32write;
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struct b43_dfs_file file_tsf;
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struct b43_dfs_file file_ucode_regs;
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struct b43_dfs_file file_shm;
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@ -46,6 +50,11 @@ struct b43_dfsentry {
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struct b43_txstatus_log txstatlog;
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/* The cached address for the next mmio16read file read */
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u16 mmio16read_next;
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/* The cached address for the next mmio32read file read */
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u16 mmio32read_next;
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/* Enabled/Disabled list for the dynamic debugging features. */
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u32 dyn_debug[__B43_NR_DYNDBG];
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/* Dentries for the dynamic debugging entries. */
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